CBS has issued the press release for the next Thursday's episode of The Big Bang Theory. Star Wars' James Earl Jones guest stars and Carrie Fisher makes a cameo appearance in this episode.

The Convention Conundrum – After the guys can't get Comic-Con tickets, Sheldon tries to hold his own convention and winds up spending a wild night with James Earl Jones. Meanwhile, the girls see if they can act like "grown-ups," on THE BIG BANG THEORY, Thursday, Jan. 30 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network. James Earl Jones and Carrie Fisher appear as themselves.

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